Description:Similar to Circeis armoricanabut talon more slender in side-view. Collar chaetae less geniculate with teeth not confined to the margin and arranged in serried ranks across the side (cross-striations).

Size:Up to 23 chaetigers.

Tube:Usually helically coiled as it grows away from the substratum, with translucent walls showing the orange body within.

Colour:Transparent to orange-red.

Habitat:On hydroids and bryozoans in strong currents; sublittoral.

Distribution:Arctic, North Pacific, North Atlantic to Azores, North Sea, Skagerrak, Kattegat, Öresund and Bay of Kiel.California.